You can exchange fiat currency (USD, EUR...) for cryptocurrency on many available crypto exchanges. You will have to decide on an crypto exchange yourself. Once you buy the crypto on the exchange, transfer it to your BC Vault to secure it against theft.
You can also buy cryptocurrency directly in the BC Vault Desktop Application through our partners, see:
Wyre - Purchase crypto currencies from the BC Vault Application
Changelly - Fast and secure way to exchange crypto currencies